Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net (loss) income	$ (3,855)	$ 127,114
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	51,263	(50,735)
Decrease in unrealized value of marketable securities	(258)	(4,534)
Other comprehensive income (loss)	51,005	(55,269)
Comprehensive income	47,150	71,845
Net loss (income) attributable to noncontrolling interests and preferred units distributions	129	(8,575)
Net loss attributable to noncontrolling interests	1,499	293
Other comprehensive (income) loss attributable to noncontrolling interests	(2,655)	2,886
Comprehensive income attributable to SL Green/SLGOP	44,624	66,156
SL Green Operating Partnership
Net (loss) income	(3,855)	127,114
Other comprehensive income (loss):
Increase (decrease) in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments	51,263	(50,735)
Decrease in unrealized value of marketable securities	(258)	(4,534)
Other comprehensive income (loss)	51,005	(55,269)
Comprehensive income	47,150	71,845
Net loss attributable to noncontrolling interests	1,499	293
Other comprehensive (income) loss attributable to noncontrolling interests	(2,655)	2,886
Comprehensive income attributable to SL Green/SLGOP	$ 45,994	$ 75,024